From owner-freebsd-net@freebsd.org  Thu Feb 22 07:50:37 2018
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Subject: Re: Racoon and setkey problems
To: Misak Khachatryan <kmisak@gmail.com>,
 "Andrey V. Elsukov" <bu7cher@yandex.ru>
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From: Eugene Grosbein <eugen@grosbein.net>
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Date: Thu, 22 Feb 2018 14:50:26 +0700
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On 22.02.2018 14:10, Misak Khachatryan wrote:
> Hello there,
> 
> just a quick feedback. I've added rules to my ipfw to block all isakmp
> ports on interfaces not involved in ipsec and rebooted 3 of 4
> machines. Situation returned to normal on them, but rebooting fourth
> host is very painful. It seems i have some kind of massive ipsec
> probes from botnet which fills all my SAD and SPD entries or PFKEY
> sockets.
> 
> All i need is to flush all SAD and SDP entries, but setkey can't do
> that. Is there any other way?

Try to increase sysctl kern.ipc.maxsockbuf upto some huge value like 80MB
and re-try with setkey.